硅酸盐碳星的新目录

IF 1.1 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Journal of the Korean Astronomical Society Pub Date : 2014-08-31 DOI:10.5303/JKAS.2014.47.4.123
Young-Joo Kwon, K. Suh
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引用次数: 8

摘要

硅酸盐碳星是一种具有星周硅酸盐尘埃特征的碳星。我们从文献中收集了44颗硅酸盐碳星样本,并对分类的有效性进行了研究。对于一些天体来说,中心恒星是否是碳星是不确定的。我们确认有29个天体被证实是硅酸盐碳星。我们根据中心恒星的演化阶段将确认的天体分为三个亚类。为了研究从O到C的化学转变相的影响,我们使用了分离硅酸盐粉尘壳的辐射传输模型。将硅碳星的光谱能量分布和红外双色图与理论模型结果进行了比较。对于不考虑圆盘影响的化学跃迁模型,我们发现硅酸盐特征的寿命约为50至400年,这取决于初始尘埃的光学深度。
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A NEW CATALOG OF SILICATE CARBON STARS
A silicate carbon star is a carbon star which shows circumstellar silicate dust features. We col-lect a sample of 44 silicate carbon stars from the literature and investigate the validity of the classification. For some objects, it is uncertain whether the central star is a carbon star. We confirm that 29 objects are verified silicate carbon stars. We classify the confirmed objects into three subclasses based on the evolution phase of the central star. To investigate the effect of the chemical transition phase from O to C, we use the radiative transfer models for the detached silicate dust shells. The spectral energy distributions and the infrared two-color diagrams of the silicate carbon stars are compared with the theoretical model results. For the chemical transition model without considering the effect of a disk, we find that the life time of the silicate feature is about 50 to 400 years depending on the initial dust optical depth.
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来源期刊
Journal of the Korean Astronomical Society
Journal of the Korean Astronomical Society 地学天文-天文与天体物理
CiteScore
1.30
自引率
10.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: JKAS is an international scientific journal publishing papers in all fields of astronomy and astrophysics. All manuscripts are subject to the scrutiny of referees. Manuscripts submitted to JKAS must comply with the ethics policy of JKAS. Six regular issues are published each year on February 28, April 30, June 30, August 31, October 31, and December 31. One year''s issues compose one volume.
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